Cutting blade mounting for ground working implements



Nov. 1, 1932-. L. L. CHO-NG ET AL 1,885,231

CUTTING BLADE MOUNTING FOR GROUND WORKING IMPLEMENTS Filed Aug. 18. 1931 v INVENTORS CflLL bolgg, San/1L. (hang and L041]: L. 672011 BY Q ATTORNEY Patented Nov. 1; 1932 UNITED "STATES I ii F C LOOK GHONG; WE CHONG. AND 4 a. areas-er wearer. a Y

CUTTINGVBLADEMOUNTING ron angina, wo gxrivq.

Application filed August 18, eani e g; n ss gzre.

This invention relates to the mounting of the cutting blades of ground working implements of the rotary type andparticularly represents improvements over the structure shown, in our Patent No. 1,816,210 dated July 28, 1931. It is necessary to frequently 1 resharpen the blades and in the interests of economy it is customary after the bladeshave been resharpened several times .by grinding, so that the1r clnsel edges are worn down and relatively blunt, to restore the de- 7 sired angle of these edges prior to subsequent re-grinding operations. This is accomplished in connection with a reheating 1 of the blades and as a result of suchreheating we found from experience that very frequently the slots in the back of the blade provided thereinv for engagement with the locating rivets on the supporting pad, were no longer in proper alinement with the rivets and the slots had to be reamed out to make I a new fit before the blades could be again mounted in place. I

It is therefore the principal object of the present invention to mount the blades in such a manner that while all the advantages of the previous structure are retained, the disadvantages as above outlined are avoided and the blades can always be remounted regardless of any warping which may be had due to the reheating.

We also found that the clamping bolt or screw as provided with the previous structure tended to fracture when tightened up and a further object of this present invention is to construct this bolt so that this dif.

F g a pe pe ve V e 9 he ip rin unit'alone. I 1 ig. 3 isa similarview f the blade alone. i Fig. is a sectional elevation of the assem bl d Referring now more particularly to the characters ofreference on the drawing, each unit comprises a rigid standard 1 in the'form T of a rectangular is adapted to be bolted onto therotating structure in radial relation to the axis of: rotation as usual Projeeting forwardly from one end of the standard is a rigid base pad Q'preferably disposed at an obtuse angle to the standard in the direction of rotation of the' str'ueture. In

thetransverse plane of, said structure how= I ever the pad is disposed at right angles to the standard. The pad forms'the support I for a relatively largerectangular blade 8 which is ada ted to'be mounted on the pad in symmetrical relation thereto in front of the standard. .7

A pair of L headmembers is-rigidlysecured in the padin transversely spaced rela': 7

tion to the standard in such a' po'si-tien that the back of the blade will engage th'e sha'nks or stems 4 of the members while the heads 5 will overhang the blade and extend forwardly as shown. To make a fairly smooth fit the height of the shanks between'the heads and the pad is substantiallylequal to the thickness of the blade. The heads are of relatively large sige and are of; a substantial and non: yielding nature so that they may function to prevent 1 possible upward warping of the blades during operation without danger of snapping off.

'Disposed centrally between the members and forwardly of the same a special form of bolt or screw 6 is mounted in the pad. The head 7 of this screw is under-cut on a taper and is clear of the blade engaging surface, of the pad. This head is adapted to engage a similarly shaped slot 8 centrally positioned in the blade and cut in from the back edge of the same. The head engaging portion of the slot is disposed so that when the screw head is clampingly engaged with the blade the back of the blade will be snugly held against the rigid shanks.

The outer end of the screw does not project outwardly of the pad so that it will not be worn away by contact with the ground. A non-circular bore 9 is provided in the screw from end to end, said bore being adapted to receive a turning tool. By reason of this feature of construction not only may the screw be manipulated from end to end but a stronger grip with the turning tool may e obtained since the tool engages the screw from one endto the'other. This distributes 1 the strains over the entire length of the screw and avoids any tendency of the relatively weakened threaded portion to fracture. A

WVhen removing the blade the screw is not entirely removed from the pad but only sufficient to allow the blade to he slid from under the screw head. The screw then forms a loeating means for the blade when it is replaced and assures the slot being properly disposed relative to the screw without any try-and-fit operations having to be resorted to.

From the foregoing description it will be readily seen that we have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still'in practice such deviations from such detailmay be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims;

1 Having thus described our invention what we claim as new and useful and desire to se- 5 cure by Letters iatent is:

Means to detachably secure a blade against a supporting pad, said pad havinga tapped hole extending therethrough said means com prising a headed screw projecting through the blade and threaded into the pad-hole; said screw having a non-circular bore extending completely therethrough to receive a turning tool of similar form whereby upon the insertion of the tool, any dirt in the bore will be 45 pushed out of the same.

In testimony whereof we afiix our signatures.

LOOK L. OHONG. JUE L. CHONG. 50" SAM L. CHONG. 

